About the Number 231 (two hundred thirty-one)

This nBAB was the 231st BAB for the the Spring 2009 session. 231 set a new record for most BABs posted during a session breaking the previous record 230 BABs set during the Fall 2008 session.

   MathBabbler Number Analyst (MBNA) output:
   =========================================
   231 is a natural, whole, integer
   231 is odd
   231 proper divisors are: 1,3,7,11,21,33,77,
   231 is deficient (sum of divisors is 153)
   231 is unhappy
   231 is not a Harshad number
   231 is not prime
   231 has the prime factors: 3*7*11 (sum=21)
   231 is sphenic (had 3 unique prime factors)
   231 sum of prime factors is: 21
   231 in octal is 0347
   231 in hexadecimal is 0xe7
   231 in binary is 11100111 (is evil)
   231 nearest square numbers: -6...25 (225 [15]...256 [16])
   sqrt(231) = 15.1987
   ln(231) = 5.44242
   log(231) = 2.36361
   231 reciprocal is .00432900432900432900432900432900
   231! is 1.79223e+447
   231 is 73.5296 Pi years
   231 is 11 score and 11 years
   231 written as a Roman numeral is CCXXXI

231 is one U.S. liquid gallon. [Wikipedia.org]

231 is a Lucky number. [NumberGossip.com]

231 is a square free number. [NumberGossip.com]

Creator: Gerald Thurman [gthurman@gmail.com]
Created: 27 April 2009